[joevt]

Yes, see my report above. I still have some other HDMI stuff to test with it.

[joevt]

The one I tried from Opto-Media is $195 USD, $90 USD shipping (to Canada), $39.34 CAD for FedEx customs charges COD. Altogether: $405.79 CAD. Not cheap. Still less than the price of a 4K HDMI 2.0 display…
https://windowsreport.com/4k-monitors-hdmi-2-0/

[joevt]

A sales representative at OptoMedia notified me that they can accept payment from PayPal now, so I ordered their product and they shipped it to me in 4 days.

It works! It can take any resolution from my computer’s HDMI port, up to 4096×2160  60Hz and convert it to DisplayPort 1.2 (4 lanes). For example, 800×600 75Hz also works.

The model number is CMV-535. It is similar in appearance to the CV-524 on the gomax website (also pictured on  the opto-media website). It has a dip switch (as previously mentioned) and a full size DisplayPort (instead of mini DisplayPort). 

I’m testing on a Dell 4K display. The reported EDID from the converter has manufacturer as SPT (which might mean “Sceptre Tech Inc”) and Monitor name as “Converter”. This means the converter doesn’t do EDID pass through. I’ll have to try an EDID override to see if it can work as one half of the input for a Dell 5K display.

Audio is extract only, to analog stereo (3.5 mm audio jack), and digital S/PDIF coax (RCA jack). This means the audio is not output on the DisplayPort cable.

I couldn’t determine what chips it uses. There are two relatively large chips, each covered by a small heat sink. The heat sinks can be removed. The identifying marks are difficult to read.

So far I’ve only tried it from my Nvidia Titan X (Maxwell) card’s HDMI 2.0 port in Windows and macOS. I’ll try a PS4, a cable box, and some other computers with HDMI 1.4 later.

[joevt]

[quote author="Mu7ammad"]they have images on their website but it is an updated version. i have the one which is simply a display port on one end and an hdmi adapter on the other end with a usb to power it. they have an actual conversion box now. i do not know if this has any performance related benefits.[/quote]

What website?

Are you sure the adapter you have does 4K @ 60 Hz? I have a couple that look like that and they only do 4K @ 30 Hz.

[joevt]

Too much of a hassle to get one. It’s like they don’t want people to buy it…

I haven’t heard from gomax. That probably means they won’t reply.

partilink said the first batch of goods will be released end of March 2018 or middle April (but no idea about a North America release). They might be able to provide a unit in January but I think probably not. I didn’t get a price.

[joevt]

I got the same quote from opto media. “T/T in advance” means you have to do a wire transfer from your bank or something like that. No convenient PayPal.

They also sent a data sheet for the product, model CMV-535, which is nearly identical to the gomax CV-524. They say the CMV-535 is a newer model. It adds a dip switch for changing the EDID to one of 4 standard HD timings, but they say it can do any resolution up to the max.

While there may be inexpensive HDMI 2.0 displays, where this converter might be really useful is when you must use use an HDMI output to a DisplayPort display. For example, if you have two Dell 5K displays, it takes two DisplayPorts each, but an Nvidia card only has 3 DisplayPorts and one HDMI. I don’t know if this converter would allow 5K for the Dell using DisplayPort + HDMI, but it would be interesting to try. The driver just needs to know that both connections are going to the same display – this requires the EDID be sent correctly, or that you have the ability to override it correctly.

NVidia should replace the HDMI output with a DisplayPort, because there are plenty of DisplayPort to HDMI 2.0 adapters but none that go from HDMI 2.0 to DisplayPort (except these expensive hard to get converters).

[joevt]

The opto-media and gomax products look the same (at least have the same features). The gomax product pages has more details and the opto-media product seems to match. They have an analog stereo output (3.5 mm connector) and an RCA output (S/PDIF for HDMI Audio Format: PCM2/5.1/7.1, Dolby 5.1/7.1, DTS 5.1/7.1). The GoMax specifically states there is no audio over DisplayPort. This may be a problem if you want to use the speakers of your display. The opto-media is probably the same.

The partilink has a second DisplayPort port for splitting. There are no other audio outputs so audio must come from the DisplayPort ports.
Pros:
1) Both video and audio can be duplicated on two devices (gomax and opto-media have video to one device and digital audio to a different device and analog audio to a third device)
2) Audio and video are transmitted over DisplayPort (gomax and opto-media have video to one device and audio to two other devices using RCA S/PDIF and 3.5 mm analog stereo)
Cons:
1) Audio is only stereo and only over DisplayPort (gomax and opto-media support HDMI formats and analog stereo but not over DisplayPort)

That information comes from the product pages. I might have made some incorrect assumptions based on that. Testing may have different results.

I haven’t e-mailed them for pricing and availability. Products that don’t have displayed pricing or online retail presence might be expensive?

[joevt]

Found a third one from Taiwan. This one has more technical information.
http://www.gomax-electronics.com.tw/product_show.php?show=301

[joevt]

That looks promising. I googled “HDMI 2.0 to DisplayPort 1.2a Converter” and found this:
http://www.opto-media.com/goods.php?act=category&no=55
It’s also from Taiwan, same as Partilink.

[joevt]

Sorry, I totally forgot to include the Club 3d products.

What’s the difference between the CAC-1330 and CAC-2330?

The CAC-1330 is DisplayPort 1.1, so I suppose it uses 4 lanes for 4K @ 30 Hz? It has HDCP 1.3 instead of 1.4. It has CEC.

The specification pdf for the CAC-1330 says HBR2 link rate, but HBR2 is only for DisplayPort 1.2, or is link rate separate from the standard in this case?

The CAC-2330 is also DisplayPort 1.1. Same or different chip? It has HDCP 1.4. It doesn’t have CEC or it was not mentioned in the specification pdf?

The CAC-1330 says max 3840×2160 30 Hz while the CAC-2330 says 4096×2160 at 30 Hz. Why would that difference exist?

Could a firmware update make them the same?

[joevt]

google will find it:
“STDP2600 HDMI to DisplayPort” this also finds one by delock
“Startech HDMI to DisplayPort”
“SIIG HDMI to DisplayPort”
“gofanco HDMI to DisplayPort”
“delock HDMI to DisplayPort”

[joevt]

I’ve tried one from SIIG and Startech. They both use the STDP2600 from MegaChips for 4K 30 Hz. The SIIG has a thicker cable and a metal case. I’ve found one on Amazon from gofanco which looks like the Startech.

[joevt]

Club3D makes adapters, not the chips in the adapters. No chip = no adapter.

[joevt]

Maybe GaminTechSales should get a website. Using Twitter seems like a horrible idea. There should be a searchable products page somewhere. Does the adapter have a model name/number? Is there a picture of the product? What chips does it use?

[joevt]

Was my explanation above not sufficient? Go to wikipedia to learn the difference between DisplayPort 1.2 and DisplayPort 1.3. The ANX7688 can only do 4K 60 Hz using DisplayPort 1.3 because the ANX7688 only provides two DisplayPort lanes.

If we assume that DisplayPort 1.3 is useful to some people, then the 2 lanes of the ANX7688 seems suitable for that purpose unless the statement by MST1407 on page 1 that the device is “made for mobil devices” has some bearing. In that case, a more detailed explanation of why that would be an issue would be interesting.

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